Grinding or polishing wheel.



,0. B. WATTLES. GRINDING 0R PoLIsHING WHEEL.

APPLICATION FILED AUG. 16, v1907.

967,592. Patented Aug.' 16, 1910.

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y @X1/M N UNITED sTATEs PATENT oEEicE.

erna' B. wATTLEs, or rnovrnENcE, :enorm y rsLANn, Assreivoa To sURrnoINGISLAND.

.RHODE GRINDING OIR. POLISI-IING WHEEL.

Specicaton of Letters Patent.

Patented Aug. 16, 1910.

Application led August 16, 1907. Serial No. 388,809.

To all whom it may concern: r

Be it known that I, GYRA B. WATTLES, a citizen of the United States,`residing at Providence, in the county of Providence and State of RhodeIsland, have invented a new and useful Improvement in Grinding orPolishing Wheels, of which the following is a specification. i

This invention has reference to an improvement in grinding or polishingwheels and more particularly to an improvement in grinding or polishingwheels having a flexible `detachable covering, such as paper or clothhaving a surface of sand, emery or corundum for grinding, or a fabricadapted for polishing.

The object of my invention is to improve the construction of a grindingor polishing wheel or roll, whereby a flexible abrasive or polishingmaterial is detachably secured on the peripheral surface of the `wheelor roll and the slack of the abrasive or polishing material (caused bythe same coming into contact with the work) automatically taken up bymechanism operated by the centrifugal force of the revolving wheel orroll..

My invention consists in the peculiar' and novel construction of agrinding or polish ing wheel or roll having mechanism operated by thecentrifugal force of the revolving wheel or roll, whereby a flexibleabrasive or polishing material is detachably secured on the peripheralsurface of the wheel or roll and the slack of the same automaticallytaken up, said grinding or polishing wheel or roll having details ofconstruction, as will be more fully set forth hereinafter and claimed.

Figure 1 is a face view of my improved grinding or polishing wheel,showing a strip of flexible grinding material secured on the peripheralface of the same. Fig. 2 lis an end View of the wheel, showing the endplate partly broken away to show the counterbalanced portion of thewheel. Fig. 3 is an enlarged vertical sectional view taken on line 3 3of Fig. 2, showing the construction of the automatic take-up mechanism.Fig. 4 is an enlarged sectional view taken on line 4 4 of Fig. 3,showing the automatic take-up mechanism in its operative position. Figs.

5, 6 and 7 are still further enlarged detail views, showing the roll atthe edge of the slot in the peripheral face of the wheel, the means fordetachably securing one end of the abrasive or polishing material to thelever of the automatic take-up mechanism and the means for detachablysecuring the other end of the abrasive or polishing material to the rollrespectively.

In the drawings, a indicates a shaft, o a hollow cylindrical wheel, o anautomatic take-up mechanism and CZ a strip of flexible abrasive materialdetachably secured on the peripheral surface of the wheel by detachablysecuring one end to the wheel and the other end to the automatic take-upmechanism o.

The shaft a is supported in suitable bearings (not shown) and revolvedat a high rate of speed by any usual means.

The wheel o is constructed to have a central hub 8 secured to the shaftc, a closed end 9, an annular flange 10 in the peripheral face of whichis a transverse slot ll parallel with the shaft a, a thickenedtransverse rib 12 having a curved inner face 13 merging into a roundededge 14 forming one edge of the slot 11, and a transverse slit 15 in thecurved inner face 13 extending into a tubular transverse hole 1G in therib l2, a thickened transverse rib 17 having a curved inner face 18,

a roll 19 rotatably supported inthe rib 17 and forming the opposite edgeof the slot ll, an opening 20 formed in the edge of the end 9 on a linewith the slot ll and a thickened counterweighted portion 21 on the in#ner face ofthe flange 10 opposite the slot 1l and shown in Figs. 2, 8and 4.. `A circular end plate 22, having a central hole 23 for the shafta, a curved slot 2li, and an opening 25 corresponding to the opening 20inthe edge of the end 9, is secured to the edge of the flange 10 byscrews in a position for the opening 25 to coincide with the `opening20, as shown in Figs. 2 and 3.

` The automatic take-up mechanism o consists of a stud 26 secured to theend 9 parallel with the shaft a and under the slot l1, a bent lever 27pivotally supported adjacent its center on the stud 26 and having aweighted inner end 28 and an outer enel 29 the Width of which isapproximately the interiorwidth of the wheel. of the lever 27 isconstructed to have a tubular hole 3() extending through the width oftheend and a slit 31 extending from the tubular hole 30 out through theend, as

- shown in Figs. 4 and 6. A coiled spring 32 ends 34 and 35 formed byclamping a strip of metal over the ends and then folding the strip ofmetal, as shown in Figs. 6 and 7.

The strip of abrasive material 0l is secured on the peripheral surfaceof the wheel by sliding the beaded end 34 through either of the openings2() or 25 into the tubular hole 16, with the adjacent portion of thestrip extending out through the slit 15, over the curved inner face 13and rounded edge 14, and out through the slot 11, as shown in Figs. 4and 7. The strip of abrasive material is now wrapped around theperipheral surface of the wheel, a suitable tool inserted through thecurved slot 24 in the plate 22 against the Vspring side of the lever 27and the end 29 of the lever moved into a central position Linder theslot 11 against the tension ofthe coiled spring 32. The beaded end 35ofthe strip of abrasive material is now secured to the end 29 of thelever 27 by sliding the same into the cylindrical hole 30 in the end ofthe lever with the adjacent portion of the strip extending through theslot 1l and over the roll 19. The lever 27 is now released, when throughthe tension of the spring 32 the end 29 of the lever and the beaded end35 of the strip Z are pulled to ward the stud 33, thereby drawing thestrip of abrasive material closely onto the peripheral surface of thewheel. When in use the wheel is revolved at a high rate of speed in thedirection of the arrow, as shown in Figs. 2 and 4. The centrifugal forceof the revolving wheel acts on the take-up mechanism c to throw theweighted end 28 Vof the lever 27 outward or away from the center of thewheel, thereby moving the end 29 of the lever in the direction in whichthe wheel is'revolving and automatically taking up the slack of thestrip of abrasive material d caused by the same stretching throughcomingy intoV contact with the work. The roll 19 materially assists themovement of the strip of abrasive material around the edge of the slot11 and the coiled spring 32 could have sufficient tension only to holdthe take-up mechanism in its operative position, when it The outer end29 can be readily seen that after the wheel has started to revolve, theaction of this spring is practically eliminated, or the spring couldhave sufficient force to materially assist the take-up action of thetake-up mechanism.

It is evident that the structural details of the take-up mechanism ccould be varied without materially affecting the spirit of my invention.

Having thus described my invention, I claim as new and desire to secureby Letters Patent;-

1. A grinding or polishing Wheel having a hub adapted to be secured to ashaft, a closed end, an annular flange on the closed end forming theperipheral face of the wheel, a transverse slot in the fiange parallelwith the hub, an automatic take-up mechanism consisting of a weightedlever having its fulcrum adjacent its center and operated by centrifugalforce, a spring for holding the lever in operative position, a strip ofabrasive or polishing material on the peripheral face of the wheel,means for securing one end of the abrasive or polishing material to theinner face of the annular ange, and means for securing the other end ofthe abrasive or polishing material to the weighted lever forming theautomatic take-up mechanism.

2. A grinding or polishing wheel having a hub adapted to be secured to ashaft, a closed end, an annular flange on the closed end forming theperipheral face of the wheel, a transverse slot in the flange, anautomatic take-up mechanism consisting of a pivoted lever weighted atits inner end and operated by centrifugal force, a strip of abrasive orpolishing material on the peripheral face of the wheel, means forsecuring one end of the abrasive or polishing material to the inner faceof the annular flange through the transverse slot, means for securingthe other end of the abrasive or polishing material to the outer end ofthe weighted lever through the transverse slot, and a spring for holdingthe weighted lever in operative position.

3. In a grinding or polishing wheel, the combination of a shaft a, ahollow cylindrical wheel b having a central hub 8, a closed end 9, anannular flange 10 in the peripheral face of which is a transverse slot11, a transverse rib 12 having a rounded edge 14 forming one edge of theslot 11, and a slit 15 extending into a tubular hole 16 in the rib 12, atransverse rib 17, a roll 19 rotatably supported in the rib 17 andforming the opposite edge of the slot 11, an opening 20 formed in theedge of the end 9, a thickened counterweighted portion 21 on the flange10, a circular end plate 22 having a central hole 23 for the shaft a, acurved slot 24 and an o eninff in its edge an automatic take-n)mechanism c consisting of a stud 26 secured to the end 9, a lever 27pivotally supported adjacent its center on the stud 26 and have ing aWeighted inner end 28 and an outer end 29 in Which is a tubular hole 30and a slit 3l extending from the hole 30 out through the end of thelever, a coiled spring 32 Connected to the end 29 of the lever 27 and toa stud 33 secured to the end 9 of the 10 wheel, and an abrasive materiald consisting name to this specification in the presence of 15 twosubscribing Witnesses.

CYRA B. WATTLES. Witnesses:

ADA E. HAGERTY, J. A. MILLER.

